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174 Phaedra (A877 RA)
Classification: Main-belt Asteroid          SPK-ID: 2000174
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 51 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1411614255845109 3.8019e-08  
a 2.861916562220357 1.0438e-08 au
q 2.457924340393409 1.0881e-07 au
i 12.12324734321833 4.4142e-06 deg
node 327.657034374718 1.9744e-05 deg
peri 289.5067493944895 2.5506e-05 deg
M 255.2908071526183 1.8181e-05 deg
tp 2459514.858818296046
(2021-Oct-27.35881830)
9.0238e-05 TDB
period 1768.413732846445
4.84
9.6742e-06
2.649e-08
d
yr
n .2035722711904882 1.1137e-09 deg/d
Q 3.265908784047305 1.1911e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2824  
   data-arc span      52102 days (142.65 yr)  
   first obs. used      1877-09-03  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45167  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:00:13  

Additional Information
 Earth MOID = 1.47496 au 
 Jupiter MOID = 2.00501 au 
 T_jup = 3.254 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455812.5 (2011-Sep-08.0) TDB
Reference: JPL 51 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1445428931525904 3.8095e-08  
q 2.446935253232717 1.0945e-07 au
tp 2455978.247533226908
(2012-Feb-20.74753323)
8.3437e-05 TDB
node 327.7385735662225 1.9751e-05 deg
peri 289.3270765030896 2.5261e-05 deg
i 12.12789524617763 4.415e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2824  
   data-arc span      52102 days (142.65 yr)  
   first obs. used      1877-09-03  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45167  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:00:13  

Additional Information
 Jupiter MOID = 2.00501 au 
 T_jup = 3.254 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.451195302191239E-15 -4.156069495436811E-15 1.991952943347079E-13 4.832564253600309E-16 5.279769914822631E-14 1.410591494013694E-15
q -4.156069495436811E-15 1.198019187875526E-14 -4.854681047087317E-13 -2.673831070708699E-15 -1.373614701069151E-13 -3.806783169196252E-15
tp 1.991952943347079E-13 -4.854681047087317E-13 6.961779364196314E-9 -3.326296280927173E-12 1.336113340803932E-9 -7.36247021535625E-14
node 4.832564253600309E-16 -2.673831070708699E-15 -3.326296280927173E-12 3.900959459672316E-10 -3.814224502823937E-10 -5.928329923985977E-12
peri 5.279769914822631E-14 -1.373614701069151E-13 1.336113340803932E-9 -3.814224502823937E-10 6.381326266156035E-10 5.79290604179167E-12
i 1.410591494013694E-15 -3.806783169196252E-15 -7.36247021535625E-14 -5.928329923985977E-12 5.79290604179167E-12 1.949258321197394E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 8.3   n/a MPO502154 IRAS observations used: 19
diameter diameter 64.849 km 0.392 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 5.744 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Magnusson, P.; Lagerkvist, C.-I. (1991) Astron. Astrophys. Suppl. Ser. 87, 269-275.]
[Sada, P.V.; Cooney, W. (2001) Minor Planet Bull. 28, 39-40.]
[Wang, X.-B.; Shi, Y. (2002) Earth, Moon, and Planets 91, 181-186; Wang, X.-B. (2002) Proc. ACM 2002, ESA SP 500, 501-503.]
[Ivarsen, K.; Willis, S.; Ingleby, L.; Matthews, D.; Simet, M. (2004) Minor Planet Bull. 31, 29-33.]
[Durech, J. (2006) IAU 2006, poster paper.]
[Ruthroff, J.C. (2009) Minor Planet Bull. 36, 121-122.]
[Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.]
[U. Iowa Physics web site (2011) http://phobos.physics.uiowa.edu/research/asteroids/]
[Marciniak, A.; Michalowski, T.; Polinska, M.; Bartczak, P.; et al. (2011) Astron. Astrophys. 529, A107.]
[Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.169   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.858   0.018 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=10.52, mean=14.11, max.=17.69) deg.
U-B UB 0.484   0.050 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=10.52, mean=14.11, max.=17.69) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices
SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

174 Phaedra (A877 RA)          Discovered 1877-Sep-02 by Watson, J. C. at Ann Arbor
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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